What standard does P460NH comply with?

P460NH is a non-alloy pressure vessel steel grade specified in EN 10028-3. It has good weldability, high strength and toughness, suitable for manufacturing pressure vessels and boilers operating at moderate temperatures.

Comparison with Subgrades

P460NH is part of a family distinguished by impact testing temperatures:

P460NH: Impact tested at -20°C (Standard/High temperature).

P460NL1: Impact tested at -40°C (Low temperature).

P460NL2: Impact tested at -50°C (Extra-low temperature).

International Equivalents

Germany (DIN): WStE460

France (AFNOR): E460FP

China (GB): Q460R

Russia (GOST): 18G2

advantages

• High strength: With a minimum yield strength of 460 MPa, P460NH provides excellent load‑bearing capacity, allowing for the design of lighter and more cost‑efficient structures without compromising safety.

• Good toughness at low temperatures: The steel maintains high impact energy even at temperatures down to approximately -20°C, reducing the risk of brittle fracture and ensuring reliable performance in cold environments.

• Excellent elevated‑temperature performance: P460NH retains its strength and microstructure stability under long‑term exposure to temperatures up to around 400°C, making it ideal for boiler and pressure vessel components.

• Good weldability: The material can be readily welded using standard industrial processes, provided appropriate preheating and interpass temperature control are applied. This simplifies fabrication and reduces production costs.

• Superior fatigue and creep resistance: Its balanced mechanical properties enable it to withstand cyclic loading and thermal stresses, extending the service life of critical equipment.

• Consistent quality and reliability: Produced under strict European standards (EN 10028‑3), P460NH ensures uniform properties across thicknesses and batches, making it a dependable choice for safety‑critical applications.

processing

• Heating and forming: The steel should be heated uniformly to the recommended temperature range before hot forming, typically between 850°C and 1100°C, to ensure good ductility and avoid cracking. After forming, controlled cooling helps preserve the normalized microstructure and toughness.

• Welding procedures: P460NH is weldable using common methods such as SMAW, GMAW, and SAW, but preheating is often necessary to reduce the risk of hydrogen‑induced cracking. Preheat temperatures usually range from 100°C to 200°C, depending on plate thickness and welding process. Interpass temperatures must also be controlled to prevent excessive heat input.

• Heat treatment: As a normalized steel grade, P460NH is typically supplied in the normalized condition. Post‑weld heat treatment (PWHT) may be required for thick sections or critical applications to relieve residual stresses and improve toughness.

• Cutting and machining: The material can be cut using flame cutting, plasma cutting, or shearing, with proper edge preparation to avoid cold cracking. Machining is generally straightforward, but tool wear may be higher due to the steel's high strength, so appropriate tools and cutting parameters are recommended.

• Surface preparation and inspection: All surfaces should be cleaned and free from contaminants before welding or coating. Non‑destructive testing such as ultrasonic or radiographic inspection is often performed to ensure the quality of welds and base material.

applications

• Pressure vessels: Used in reactors, heat exchangers, and storage tanks in the petrochemical, chemical, and oil and gas industries.

• Boiler components: Applied in boiler drums, headers, and other pressure parts of thermal power plants.

• Offshore structures: Utilized in offshore platforms, subsea pipelines, and floating production units.

• High‑temperature piping: Used in steam pipelines and other high‑pressure piping systems.

• Heavy engineering equipment: Applied in large‑diameter pipes, pressure‑containing structures, and heavy machinery components.

• Industrial processing equipment: Used in autoclaves, pressure vessels for food processing, and other high‑pressure processing systems.

Contact now

If you have project requirements for P460NH, we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:beam@gneesteelgroup.com.

Can P460NH be used in low-temperature environments?

Yes, P460NH can be used in low-temperature environments down to -20°C, thanks to its excellent impact toughness at that temperature. It is suitable for equipment operating in cold regions or low-temperature media.

What is the delivery condition of P460NH?

P460NH is usually delivered in normalized condition (N), which involves heating to 850-950°C, holding for a certain time, and air cooling. This refines grains and improves mechanical properties.

What is the thickness range of P460NH plates?

The common thickness range of P460NH plates is 6-200mm. Thicker plates may require special heat treatment or preheating during welding to ensure uniform performance and avoid defects.

How to inspect the quality of P460NH?

Quality inspection of P460NH includes chemical composition analysis, mechanical property tests (tensile, yield, impact), ultrasonic flaw detection, and visual inspection to ensure compliance with EN 10028-3 standards.

What is the difference between P460NH and P460N?

The main difference is the impact test temperature. P460NH is tested at -20°C, while P460N is tested at 20°C. P460NH has better low-temperature toughness, suitable for colder operating conditions.

Can P460NH be heat treated after welding?

Yes, post-weld heat treatment (PWHT) like stress relief annealing (550-650°C) is optional for P460NH. It reduces welding residual stress, improves weld toughness, and enhances corrosion resistance.

What corrosion resistance does P460NH have?

P460NH has basic atmospheric and water corrosion resistance. For harsh environments (e.g., acid, saltwater), additional anti-corrosion measures like painting, galvanizing, or coating are required to extend service life.

Is P460NH suitable for boiler drum manufacturing?

Yes, P460NH is ideal for boiler drum manufacturing. Its high strength, good weldability, and sufficient toughness at moderate temperatures meet the strict requirements of boiler drums for pressure and safety.

What is the density of P460NH?

The density of P460NH is approximately 7.85 g/cm³, the same as common carbon steels. This density is used for weight calculation in equipment design and manufacturing.

What is the elongation requirement of P460NH?

P460NH requires a minimum elongation of 20% (in 50mm gauge length). Good elongation ensures the material has sufficient ductility, allowing plastic deformation before fracture.